12.53% is the change from 399 to 449
Calculation steps:
[( 449 - 399 ) ÷ 399] x 100 = 12.53%
Formula
Percentage change = [(449 - 399) / 399] x 100
Subtract the new number by the original number
449 - 399 = 50
50 ÷ 399 = 0.12531328320802004
0.12531328320802004 x 100 = 12.53%